It is pretty glitchy, takes several clicks to select anything in when making PCs. There is almost nothing there, as in the races/classes/etc are described in fluff but do not give you the actual game rules to peruse. Also the characters come out totally wrong and unusable, really. No Proficiency bonus sometimes and attributes bouncing up to 22 (not sure how). So very much an Alpha rather than a BETA to me. You can make PCs, that can't be used in the game (unless you go over with a fine toothed comb and error check) and as long as you choose by fluff only (cos I ain't no power gaming munchkin!) and you don't want to personalise things like bonds and flaws...
The 'power' of the system will be when all the moving parts are in, I guess, but I find it hard to 'test' when the PCs made are unusable. Hopefully those errors will be fixed quickly and the real testing, UI and integration, can begin.